The 99 (and older) ECU can not simply reflashed via thru the OBCII socket. That is why you have to send in your ECU. They have to open it up to reprogram the eprom...or they may just replace it since I am not sure if it is re-writeable.
I am guessing that's the reason for the higher cost, they actually have to do a little manual labor instead of simply sending you a file to upload to your ECU.
Even with the bit of labor involved...$500 more for a pre-2000 flash is simply nuts imo but then I really don't know what is entirely involved either.
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- ian
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